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Old 05-16-2018, 10:55 PM   #1
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Throttle butterfly (not throttle body) sync

I read through this massive thread and came away wondering if your throttle butterflies are our of sync it would cause excessive vibration.

http://www.twtex.com/forums/showthre...+screw&page=12

It's well known by FJR1300 riders syncing the throttle plate so they open at the exact same time drastically reduces vibration and I'm wondering if a similar procedure has been done on a Bandit for this reason.

Of there is a written procedure anywhere at all?
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Old 05-16-2018, 11:06 PM   #2
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Re: Throttle butterfly (not throttle body) sync

"I read through this massive thread and came away wondering if your throttle butterflies are our of sync it would cause excessive vibration."


Yes, the more out of sync, the more vibration. The most extreme example: Remove the screws that hold one of the butterflies to the common bar running through all the carbs, not allowing the butterfly to open. Lots of vibration as well as a fouled plug.
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Old 05-16-2018, 11:10 PM   #3
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Re: Throttle butterfly (not throttle body) sync

How many adjustment screws are there? I think mine may have been messed with, that thread speaks of using a feeler gauge to realign them. Anyone know anything about how to do that? My dealer says it won't do anything of course.
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Old 05-17-2018, 12:30 AM   #4
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Re: Throttle butterfly (not throttle body) sync

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Originally Posted by Drop_Center View Post
How many adjustment screws are there? I think mine may have been messed with, that thread speaks of using a feeler gauge to realign them. Anyone know anything about how to do that? My dealer says it won't do anything of course.
Three adjustment screws on a set of four carbs. The feeler gauge method will only get you close.
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Old 05-17-2018, 07:17 AM   #5
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Re: Throttle butterfly (not throttle body) sync

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Three adjustment screws on a set of four carbs. The feeler gauge method will only get you close.
So after you've done the feeler guage, how do you get them precisely in sync?

Last edited by Drop_Center; 05-17-2018 at 07:19 AM.
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Old 05-17-2018, 11:02 AM   #6
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Re: Throttle butterfly (not throttle body) sync

Vacuum gauges or mercury manometer tubes are the two most common. A set of 4 work the best, but it can be done with one gauge by adjusting one cylinder at a time to the reference cylinder (the one without an adjusting screw). Using the one gauge method requires multiple checks of each cylinder since adjusting one cylinder affects the vacuum on the other cylinders also.
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Old 05-17-2018, 11:04 AM   #7
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Re: Throttle butterfly (not throttle body) sync

If you get them within a cm using the feeler gauge method, go buy a lottery ticket.
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Old 05-17-2018, 05:26 PM   #8
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Re: Throttle butterfly (not throttle body) sync

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Originally Posted by humanrace View Post
Vacuum gauges or mercury manometer tubes are the two most common. A set of 4 work the best, but it can be done with one gauge by adjusting one cylinder at a time to the reference cylinder (the one without an adjusting screw). Using the one gauge method requires multiple checks of each cylinder since adjusting one cylinder affects the vacuum on the other cylinders also.
So this is different than syncing the TB's, correct? I've used a vacuum gauge for a TB sync before but not anything with the butterflies.
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Old 05-17-2018, 08:07 PM   #9
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Re: Throttle butterfly (not throttle body) sync

Should be the same game, slightly different animal, but synching is synching.
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Old 05-17-2018, 08:55 PM   #10
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Re: Throttle butterfly (not throttle body) sync

I'm confused, do you hook the manometer up to the same ports for the TB sync as well as the butterfly sync?
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Old 05-18-2018, 11:09 AM   #11
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Re: Throttle butterfly (not throttle body) sync

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I'm confused, do you hook the manometer up to the same ports for the TB sync as well as the butterfly sync?
Yes. All you are doing is adjusting each butterfly to flow the same amount of air.
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Old 05-18-2018, 07:49 PM   #12
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Re: Throttle butterfly (not throttle body) sync

Very interesting and thank you for the help.

One other question, that guy in the thread was explaining how once you touch the butterfly adjustment, you have to remove them to realign with a feeler gauge. Any idea what he meant there?
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